CHARACTERIZATION OF ENTEROTOXIGENIC BOVINE ESCHERICHIA-COLI

  • 1 January 1976
    • journal article
    • research article
    • Vol. 40  (3) , 247-251
Abstract
Of 300 isolates of bovine E. coli, 56 of which were enterotoxigenic in calf gut loops were characterized on the basis of O and K antigens, colonial morphology and resistance to 7 antimicrobial drugs. The 56 isolates enterotoxigenic in the calf were compared with the nonenterotoxigenic ones. Of the 56 enterotoxigenic E. coli the majority possessed the A type of K antigen and had OK groups, 09:K (PS274) or 0101:K (RVC118). Of these isolates, 14 had the K99 antigen. None of 27 isolates found enterotoxigenic in the piglet but not in the calf possessed the K99 antigen or belonged to OK groups 09:K(PS274) or O101:K(RVC118). Comparison of the patterns of resistance to 7 antimicrobial drugs showed that all enterotoxigenic and nonenterotoxigenic isolates were susceptible to nitrofurantoin and sulfachlorpyridiazine and that there was no significant difference in the patterns between the 2 groups. The majority of enterotoxigenic isolates were mucoid, and most of the nonenterotoxigenic isolates were nonmucoid.